After trying to unzip the latest Microsoft Edge Vm zip file on my mac I end up with a *.cpgz file.
Its supposed to result in a *.ova file for virtualBox.
Anyone
http://mattormeeple.com/2015/08/19/unzipping-large-zip-archives-on-mac-like-latest-microsoft-edge-vm/
Running the following worked great (ditto is installed by default):
$ ditto -x -k Microsoft\ Edge.Win10.For.Windows.VirtualBox.zip edge